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Nanomécanique aux interfaces : Applications à l'étude de couches de phospholipides et à l'interface air-liquide.

Abstract : Atomic force microscopy (AFM) is used for various applications. This work aims here at studying mechanical properties, at the nanometer scale, of phospholipids monolayers and multilayers with an atomic force microscope in the dynamic mode. The non-linear dynamic behaviour of an oscillating tip-cantilever system, near phopholipids layers, is analyzed based on a coarse graining model. AFM is also applied to study the influence of a membrane peptid, Syntaxyn, and the features of self-assembled phospholipids layers on mica. In a next step, we investigate the oscillation behaviour of a clamped AFM microlever in liquids. The experimental results are compared to theoretical predictions from the numerical solutions of the three-dimensional Navier--Stokes equation, to measure the influence of the fluid motion on the oscillating behaviour of an AFM cantilever. We also show that the drag hydrodynamic force can be reduced by almost an order of magnitude when reducing the cantilever width.using focused ion beam (F.I.B.) milling. Then, we present an analytical description that enables determining the motion of an acoustic-driven atomic force microscope cantilever in liquid. The third part is a study of the dynamical behavior of a nanomeniscus with an oscillating nanoneedle. The nanoneedle, carved with a focus ion beam, is approached to the air-liquid interface and the very end of the tip oscillates in the liquid (Water-Gycerol-PDMS). Shown is the capability to record height images of the liquid interface with resolutions at nanometer scale.
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https://tel.archives-ouvertes.fr/tel-00201126
Contributor : Cédric Jai <>
Submitted on : Monday, December 24, 2007 - 12:18:27 PM
Last modification on : Monday, January 22, 2018 - 11:02:01 AM
Long-term archiving on: : Thursday, September 27, 2012 - 1:25:10 PM

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  • HAL Id : tel-00201126, version 1

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Cédric Jai. Nanomécanique aux interfaces : Applications à l'étude de couches de phospholipides et à l'interface air-liquide.. Physique [physics]. Université Sciences et Technologies - Bordeaux I, 2007. Français. ⟨tel-00201126⟩

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